STEALTH CONVERSIONS COLORADO LOWERING BLOCKS

Stealth Conversions lowering blocks are made of solid (billet) aluminum.

The Chevrolet Colorado uses different lowering blocks than most other vehicles. For example, lowering blocks from an S-10 truck will not fit properly on the Colorado. An S-10 truck uses a 9/16" diameter alignment pin, and the Colorado uses a 15/32" alignment pin.

The Stealth Conversions lowering blocks for the Colorado are unique in that the lower hole is 15/32" and the upper hole is threaded to accept a 5/16" socket head cap screw, which has a 15/32" diameter head. This design allows bolting pinion alignment shims on top of the lowering block, as well as bolting 1/2" thick lowering blocks to the 1", 2", and 3" lowering blocks in order to make 1-1/2", 2-1/2", and 3-1/2" lowering blocks.

The Stealth Conversions lowering blocks are available in 1/2", 1", 2", and 3" thickness. The solid aluminum lowering blocks cost a lot more than most other lowering blocks because of the high cost of solid aluminum, and the additional machining required to tap the hole, but they will not fail, and are more versatile than extruded or cast lowering blocks because they can be used with pinion alignment shims, and the amount of lowering can be adjusted in 1/2" increments by bolting the 1/2" block to a 1", 2" or 3" lowering block.

If you only want to lower the rear 1/2", you can install the 1/2" lowering block directly to the leaf spring in the same manner that the pinion alignment shim is bolted to the leaf spring.   Use a  5/16"  diameter, 2-1/2 inch long, socket head cap screw to install the 1/2" lowering block directly to the stock leaf spring assembly.

Generally, lowering blocks taller than 3" (with 15" rims) are not recommended because this positions the lower spring bracket below the rim line (also called the "scrub line") and this is illegal in many states, because if the tire loses air, the bracket will drag on the ground, causing the vehicle to lose control.

PINION ALIGNMENT SHIM AND LOWERING BLOCKS

The Stealth Conversions lowering blocks are unique in that the top of the block is threaded. This allows the pinion alignment shim to attach to the lowering block, while leaving the full height of the cap screw for the rear-axle locating hole.

Pinion alignment shims for the Colorado are available from Stealth Conversions..